My first time was with d-bol for the first six months so that doesn't count as they're orals.
My first time injecting was 2cc of Deca which I shot myself in the ass, in my bathroom, in my house.
The guy who sold me the gear had written me out a list of things I should be doing and they were very similar to what guys on this board had been saying.
I was so surprised when I stuck the needle in that it didn't actually hurt. That's what made it so easy. I had no bleeding, no bruises, no marks afterwards, nothing.
I started shooting in my outer thigh after that - twice a week, alternating the legs. No problems. I then went on to my shoulders and again, nothing major.
I've probably injected over 500 times and out of those I've probably hit a vein three or four times, mostly in my shoulder. I've never had "tren cough" or "deca dick" but they did make me very paranoiid and agressive and for the last 7 months I haven't touched gear and I'm now on anti-depressants to calm me down. I'll come off them in a few months time.